public class Main {
    public static void main(String[] args) {
        Solution solution = new Solution();
    }
}
class Solution {
    public int search(int[] nums, int target) {
        int left = 0,right = nums.length-1;
        while (left<=right) {
            int mid = (left+right)/2;
            if (nums[mid]>target) right = mid -1;
            else if (nums[mid]<target) left = mid + 1;
            else return mid;
        }
        return -1;
    }
}